Priscilla Presley was very nearly a Kardashian … had her unwavering loyalty to her ex, Elvis Presley — and lack of cooking skills — not been an issue for Robert Kardashian.

In light of the new movie based on her romance with the King of Rock & Roll, Priscilla has been doing lots of promo lately … revealing in a Q&A that she had “never wanted to marry again” after Elvis because no one would match up to him.

And no one had better first-hand knowledge of her devotion to the icon post-split than Robert … who was head over heels for her when they first met and thought they would marry and have babies together.

However, in the 2017 unauthorized biography, “The Kardashians: An American Drama,” the author says Rob frequently felt like a third wheel, because Elvis repeatedly interrupted their romance in bizarre and controlling ways.

In the book, a close pal recalled Robert complaining Elvis called while he was making love to Priscilla … who then propped the bedside receiver on the pillow between them, forcing Rob to listen to their convo. Awwwkward.

According to the biography, Elvis just didn’t want his ex to see other men … for the sake of their daughter Lisa Marie.

Another blow for Robert was that romancing Priscilla came at the expense of family affairs as his older brother Tom was also interested in her … and when she chose Rob, his bro grew envious.

But, Rob’s bud Joni Migdal said the final straw for their relationship was when Priscilla cooked a meal for Robert, which he hated so much … he suggested she never make dinner for him again!

His desire to forge a life with Priscilla dissipated soon after, and as we all know, Rob went on to marry Kris Jenner and have their 4 kids … Kourtney, Kim, Khloe and Rob. Rob and Kris were married from 1978 to 1991.

Priscilla never forgot Robert, calling him one last time during his final days — as he battled cancer in 2003 — to “gently tell him she loved him.”